Evolution is genetic change in __________ that occurs over time
a. an individual
b. a population
c. a community
d. an ecosystem
e. the biosphere
B
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The difference between a Class I and a Class II tRNA synthetase is:
A. the Class I synthetase requires ATP cofactor and the Class II does not. B. the Class I synthetase uses the 2'-OH of 3' end of the tRNA as a nucleophile and the Class II uses the 3'-OH. C. the Class II synthetase reaction requires a transesterification reaction not necessary in the Class I reaction. D. the Class II synthetases are typically monomeric, whereas the Class I enzymes frequently function as multimeric protein complexes.
Which animal cell junction is correctly matched
with its function? a. adhering; allows rapid flow of substance b. tight; holds cells together c. gap; connects cytoplasm of adjoining cells d. adhering; seals adjoining cells e. gap; prevents passage of materials
Expressed sequence tags are nucleotide sequences derived from cDNA molecules.
Answer the following statement true (T) or false (F)
Evolutionary change
A. occurs through the modification of characteristics in a preexisting population. B. may involve vertical descent with mutation. C. may involve horizontal gene transfer. D. All of these choices are correct. E. None of these choices are correct.